Panasonic FV-05VF2 WhisperFit 50 CFM Low Profile Ceiling Mounted Fan, White Designed to fit 2- by 6-Inch joists or larger Blower wheel is designed to draw air in both sides allowing more area for air to enter the wheel Panasonic fans are quiet enough that you might not even know they're on An optional 3-Inch duct adaptor is included for areas where a smaller duct is necessary Rated 50 cubic feet per minute